BOULDER CITY, Nev. – The National Park Service is searching for a 45-year-old Henderson, Nevada, man who was last seen in the water near Castle Reef in the Boulder Basin of Lake Mead May 10.

At 4:44 p.m. May 10, the Lake Mead National Recreation Area Interagency Communication Center received a 911 call reporting that the man disappeared underwater. Witnesses said he was swimming and began to struggle. He was not wearing a lifejacket.

The National Park Service and Nevada Department of Wildlife began an immediate search from the point where he was last seen. Around 7:15 p.m., efforts were suspended due to unsafe weather conditions. Winds were gusting at 20-30 miles per hour.

Search efforts resumed May 11 and continue today. The incident is under investigation.